The Psychrometric Test Chamber's primary purpose is to evaluate the performance of central air conditioners and heat pumps with cooling capacity in range of 6,000 to 90,000 Btu/h (0.5 to 7.5 rated tons), and with heating capacity in range of 6,000 to 60,000 (0.5 to 5 ton rated). It consists of side-by-side indoor and outdoor chambers with temperature, humidity and air flow controlled independently.
The Test Chamber is designed to maintain a single set of operating conditions and is able to maintain conditions within the following dry bulb and web bulb temperature ranges:
Indoor = 45°F to 100°F DB; 43°F to 85°F WB
Outdoor = -20°F to 120°F DB; 35°F to 90.5°F WB.
U.S. Department of Energy Appliance and Commercial Equipment Standards Program
Energy Efficiency Standards Group: ees.lbl.gov